Reciprocating pump



Sept. 2 1924. 150K524 A. STEURS RECIPROCATING PUMP Filed lamb 15. 192:

Patented Sept. 2, 1924.

UNITED STATES;

ARSENE srnuns, or nounenors-nixnnsann BELGIUM, AssIGNoR mo f MO'ULART & GOMPAGNIE, or BRUSSELS, BELGIUM, A oonPo RA rIoNfo-r BELGIUM.

RECTPROGATING PUMP. i

Application filed narehisfieesl serial No. 625,297.

To all whom it may concern: I

Be it known that I, ARsia'Nn STEURS, a Belgian subject, residing at 18 rue du Caillouourgeois-Rixensart, Belgium, have invented certain new and useful Improvements in Reciprocating Pumps, of which the following is a specification.

The present invention relates to reciprocating pumps and is more particularly applicable to pumps for inflating pneumatictires, or for compressing air or other gases into a receptacle. The chief objectsof this invention are to provide a pumpsimple in construction and eflicient in operation, comprising only a, very small number of parts and so designed that said parts will be easy to manufacture and can be produced at a very low cost.

According to this invention the cylinder and the-crank case of the pump are cast in one piece. On the opposite side to the cylinder the crank case is provided with an aperture through which the piston and the other working parts of the pump may be introduced when the pump is being put together. The piston rod is secured at one end to the oscillating cross-pin of the piston and at its other end to a sleeve surrounding the crank pin, the crank shaft being journalled in the side wall of the crank case. The admission of the air or other fluid is preferably controlled by the piston itself, the fluid under pressure escaping through a simple check valve,

The above construction dispenses with joints and with screws, bolts, or other as sembling parts, without interfering with the possibility of readily putting the parts together. Further the cross-pin of the piston bears on the body of the piston throughout its length so that during the compression stroke the stresses are distributed over a large contact surface whereby the wear of these parts is reduced.

In the accompanying drawing which shows, by wa of this invention, Figs. 1 and 2 are two vertical sections, on lines A-B of Fig. 2 and C'D of Fig. 1 respectively, of a pump for inflating tires.

The cylinder at and crank case b of this pump are made of one piece of cast metal. In the cylinder is adapted to reciprocate the piston 0 provided with a packing ring d. In the body of the piston 0 is mounted the of example, an embodiment oscillating cross-pin e in which is screwed the upper endof the piston rodlfe On thelower end of the rod f is screwed an internally threaded socket gintegral with a sleeve h. surrounding thecrank pin ti -The crank pin is screwed in the crank j which in turn is screwed on thecrank shaft 76' which is journalled in a bearing Z, integral with the side wall of the crank case b. At its lower-end,"that =is in the side opposite the cylinder, the crank case is provided with an opening m: the diameter of which is larger than that of-the piston. This opening is normally closed bya plate n'screwed in the bottom of thecrank case. I a The cylinder (1; isprovidedwith lateral: admission or suction ports 0 which are controlled by the upper edge of the piston. At the top the cylinder has an axial outlet 72 which is normally closed by a ball-shaped valve g the movements of which are limited by a pin 1*. The nozzle 8 is adapted to be connected to the receptacle into which air is to be compressed.

To put the pump together, the piston, the cross-pin e, the rod 7 and the parts it, i, j are first assembled and then introduced into the cylinder through the opening m, whereupon the shaft 70 is shifted in the bearing Z and screwed into the crank j in the direction of the rotation of the crank shaft. The operation will be readily understood: The shaftis being driven. in any desired manner, the piston c reaching the lower end of its stroke uncovers the ports othrough which air is admitted into the cylinder.

lVhen the piston rises this air is compressed until the pressure within the cylinder causes the valve 9 to lift, the air under pressure then being forced. into the tire or other receptacle to which the nozzle 8 is connected.

In order to avoid an objectionable counter-pressure within the crank case, the shaft 70 is made with an axial bore 2? throu h which the crank case is connected with t e outside air. This: bore may also be used to introduce oil into the crank case. When the pump is in operation, the oil in the bot-' tom of the crank case is beaten by the rotating crank and thrown against the inner walls of the cylinder thus producing an eflicient lubrication of the working parts.

Undue heating of the parts is counteracted by the cooling effect of the suction on both sides of the piston, and if required, by the provisioni-of a Water jacket or of ribs to cast in one piece with the cylinder.

It will be seen that the pump shown has neither joints nor screws, bolts or other assembling members, and that all the parts are of current design and easy to manufacture. Moreover, as the piston .rod is rigidly connected to the crank pin e, the said pin may be arranged to bear throughout its length against the body of the pistonso that the stresses during the compression stroke are distributed over a large surface.

It? will be understood that tWo or more cylinders may be cast in one piece with the crank case and that other modifications may be adopted without departing from the scope of the invention.

-. I claim:

1. In, a reciprocating pump, the combination' of acylinder and a ,crank" case cast in one piece, a piston in said cylinder, a cross-pin mounted to oscillate in said piston and ,bearing throughout its length against said piston, a rod rigidly connected to said cross-pin, a crank shaft journalled in one piece, a

in a side Wall of said crank caseand adapted 2. In a reciprocating pump, the combination of a cylinder and a crank case cast ston in said cylinder, 9.-

cross-pin mounte to oscillate in Said piston and bearing throughout: its length a ainst said iston a rod havinmone end I screwed in sald cross-pin, a sleeve screwed 0n the other end of said rod, a shaftjour nalled in a side wall of said crank case,

said shaft having an axial bore, a crank screwed on said shaft, a crank pin screwed in said crank, said sleeve surrounding-said crank pin, said crank case being provided at the bottom with an opening having a larger diameter than said piston, and aplfate for closing said opening. a

In testimony whereof I have we affixed signature.

ABS-ENE STEURS; I 

